<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>块标签</title>
</head>
<body>

<!--div span-->

<!--不占满一行-->
<span>hahahaha</span>
<span>ahahahah</span>

<!--一个div 占满一行-->
<div>aaaaa</div>
<div>bbbbb</div>

</body>
</html>